\usemodule[visual]

\setscript[hanzi]
\setupalign[hanging, hz]

\usemodule[zhfontsext]
\usetypescript[cnfontb]
\setupbodyfont[cnfontb,rm,12pt] % 小四号 = 12pt
\mainlanguage[cn]

\setuplayout[header=1cm,footer=1cm,topspace=1cm,bottomspace=1cm,leftmargin=3cm,backspace=3cm,rightmargin=3cm,cutspace=3cm,edge=0cm]
\setuppagenumbering [alternative=doublesided,location=]



\setupheadertexts[margin][奇数页左边][奇数页右边][偶数页左边][偶数页左边]
\starttext
    页面 1 - 奇数页 \par\fakewords{20}{30} 
    \page
    页面 2 - 偶数页 \par\fakewords{20}{30}
\stoptext
